Final answer:
The proper order for the oxidation of a free fatty acid is beta-oxidation, Electron Transport Chain, Activation.
Step-by-step explanation:
The proper order for the oxidation of a free fatty acid is c) Beta-oxidation, Electron Transport Chain, Activation.
First, the free fatty acid undergoes beta-oxidation, which is a four-step cycle that removes carbons from the fatty acid two at a time to form acetyl-CoA. Then, the acetyl-CoA enters the Electron Transport Chain, which produces ATP. Lastly, the fatty acid is activated by conversion to a fatty acyl-CoA derivative of coenzyme A.